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Alan Carvalho de Assis 8342c51d59 ioexpander/ch422g: add a driver for the WCH CH422G I/O 
The CH422G offers eight bi-directional pins, IO0-IO7, and four open-drain
outputs, OC0-OC3.  It appears on boards that have run out of usable GPIOs
once a parallel RGB panel has taken its share, the Waveshare
ESP32-S3-Touch-LCD-7 among them, where it holds the panel and touch
controller in and out of reset and switches the backlight.

Two things about the device do not fit the shape a register-per-address
I2C driver usually takes, and both are handled here rather than pushed on
to board logic:

  - A register is selected by the I2C address the transfer is addressed
    to, not by a register address written ahead of the data.  Each access
    carries a single byte to one of four addresses.
  - None of the write-only registers can be read back, so the driver
    keeps a shadow copy of each and updates it in step with the device.

IO0-IO7 have no individual direction control; one bit of the system
parameter register drives the whole group.  The driver records the
direction asked of each pin and puts the group in output mode once at
least one of them is an output, which is what a board that drives some of
the pins would expect.  Reading a pin of a group held in output mode
reports the value last written, because the hardware cannot report the
level, and that is documented rather than hidden.

The four open-drain outputs are presented as pins 8-11 of the same
ioexpander_dev_s so that one instance covers the chip, which means
CONFIG_IOEXPANDER_NPINS must be at least 12.

Builds clean with no new warnings on esp32s3-touch-lcd7:usbnsh and passes
nxstyle.

Signed-off-by: Alan Carvalho de Assis <acassis@gmail.com>
Assisted-by: Claude Code
2026-08-24 09:39:58 +02:00
..
1wire 1wire: Move onewire_valid_rom to 1wire_crc.h 2026-06-26 22:50:43 +08:00
aie nuttx ai driver update 2024-10-17 22:35:40 +08:00
analog drivers/analog: add MCP445X potentiometer support 2026-08-08 18:37:08 +08:00
audio drivers/audio/i2s: Fix unsigned integers in function signatures 2026-07-05 15:06:04 +08:00
binfmt binfmt: Add a configuration flag to store the module filename 2025-11-01 22:59:47 +08:00
can sja1000: replace enter_critical_section with spinlock 2026-01-08 09:15:04 -03:00
clk drivers/clk: use uintptr_t for register addresses 2026-06-18 21:52:33 +08:00
contactless include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
coresight style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
crypto drivers/crypto: add Microchip RNG90 driver 2026-06-14 18:41:09 +08:00
devfreq driver/devfreq: add procfs for devfreq 2026-08-08 15:23:54 -03:00
dma include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
drivers serial/uart_rpmsg: add _raw version of driver 2026-02-23 09:19:57 -03:00
eeprom drivers/eeprom: add 24CW160 support 2026-08-06 12:39:36 +02:00
efuse include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
fs fs: enforce path search and unify inode permission helpers 2026-08-02 18:48:40 -03:00
himem include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
hwspinlock include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
i2c drivers/i2c: add ioexpander-based lower-half implementation for I2C bit-bang 2026-01-01 17:08:47 +08:00
i3c style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
input drivers/input: support ST7123 touchscreen controller 2026-08-06 12:42:15 +02:00
ioexpander ioexpander/ch422g: add a driver for the WCH CH422G I/O 2026-08-24 09:39:58 +02:00
lcd style: Fix "the the" typo across the codebase. 2026-03-23 11:07:49 +01:00
leds !drivers/pwm: remove PWM_MULTICHAN option 2026-05-18 11:35:25 -04:00
lib libc/dlfcn: Count opens so a library can be shared. 2026-08-04 11:12:49 -03:00
math drivers/math: use small lock to replace enter_critical_section 2026-01-08 11:17:17 +08:00
mbox include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
mm protect: move us_heap to userspace_data_s 2026-02-02 11:06:53 +08:00
modem style: fix checkpatch issues after debug.h move 2026-04-07 07:50:06 -03:00
motor style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
mtd drivers/mtd: add MX25UW25645G support 2026-08-19 19:16:00 +02:00
net libs/libc/netdb: Size an answer header by its header, not by its union. 2026-08-08 15:02:15 -03:00
note note/ram: support multiple noterams to dump data when panic occurs 2026-01-24 19:33:17 +08:00
nx nuttx/nx: compilation error occurs 2026-04-14 13:35:26 +08:00
pci drivers/pci:write legacy num to config space when enable legacy irq 2026-01-30 12:50:42 +08:00
pinctrl drivers/pinctrl: Add pad read-back and a procfs entry. 2026-08-21 20:04:59 +08:00
power drivers/power: Describe the regulators through procfs. 2026-08-18 17:28:02 +08:00
rc style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
regmap include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
reset drivers/reset: Add line read-back and a procfs entry. 2026-08-21 20:07:01 +08:00
rf include: migrate license to ASF 2024-11-06 19:46:13 +08:00
rpmsg drivers/rpmsg: use NuttX atomic_t API instead of C11 atomics 2026-05-21 06:28:36 +08:00
rptun rptun: add configuring the stack of rptun as static 2026-01-19 14:18:27 +08:00
segger include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
sensors sensors/tmp112: Add a uORB interface. 2026-08-18 10:35:28 -03:00
serial drivers/serial: Modify serial/pty to allow NSH/Telnet line edit 2026-07-22 22:07:18 +08:00
spi drivers/mtd: add MX25UW25645G support 2026-08-19 19:16:00 +02:00
syslog driver/ramlog: Implement the rate limiting function for ramlog driver. 2026-01-27 03:17:05 +08:00
timers drivers/timers: Add a PCF8563 RTC driver. 2026-08-18 09:29:16 -03:00
usb drivers/usbhost: Separate the xHCI driver from the PCI bus. 2026-08-18 09:35:23 -03:00
usrsock include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
vhost drivers/vhost: add vhost_get_vq_buffers() to collect scatter-gather buffers 2026-02-04 02:32:02 +08:00
video video/rgbcolors: Fix RGBTO8 to use the high bits of each component. 2026-08-04 21:17:48 -03:00
virtio include/nuttx/virtio: allow common virtio helpers to be used by vhost 2026-02-04 02:32:02 +08:00
wireless wireless/lpwan: add SX1301 LoRa concentrator driver 2026-08-06 13:01:39 -03:00
.gitignore
addrenv.h !sched/arch/libc: Give fork() and vfork() their real, separate semantics. 2026-08-10 08:57:30 -03:00
allsyms.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
arch.h !sched/arch/libc: Give fork() and vfork() their real, separate semantics. 2026-08-10 08:57:30 -03:00
ascii.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
atexit.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
atomic.h nuttx/atomic.h: use _Atomic define atomic_t. 2026-08-24 13:20:45 +08:00
bits.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
board.h drivers/usbhost/usbhost_enumerate.c: Allow selecting USB configuration 2026-05-06 06:20:03 +08:00
cache.h nuttx/cache.h: fix the compile warning in sim when enable OpenAMP 2025-12-31 02:36:29 +08:00
can.h drivers/can: move CAN utils to CAN common files 2025-05-14 10:30:25 -03:00
cancelpt.h sched/cancelpt: Fix MISRA C 2012 Rule 10.4 violations 2026-02-02 21:09:40 +08:00
circbuf.h lib/circbuf: add static initialize macro helper 2024-12-17 20:48:23 +08:00
clock.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
clock_notifier.h fs/timerfd: implement TFD_TIMER_CANCEL_ON_SET to detect clock changes 2026-01-30 17:20:24 +08:00
compiler.h nuttx/atomic.h: use _Atomic define atomic_t. 2026-08-24 13:20:45 +08:00
coredump.h coredump: fix issue that nvic region overlapped by board memory region 2025-01-24 09:15:56 +08:00
crc8.h libs/crc: implement AUTOSAR-compatible CRC algorithm 2026-01-30 17:32:15 +08:00
crc16.h libs/crc: implement AUTOSAR-compatible CRC algorithm 2026-01-30 17:32:15 +08:00
crc32.h libc/crc32: add IEEE-compatible crc32_ieee for Linux/zlib interop 2026-07-03 10:18:28 +08:00
crc64.h !compiler: drop CONFIG_HAVE_LONG_LONG and require long long support 2026-05-19 16:21:28 +08:00
debug.h drivers/clk: Add debug output levels. 2026-08-16 23:23:04 +08:00
devfreq.h drivers/devfreq: Document the frequency table contract. 2026-08-18 09:46:47 -03:00
elf.h nuttx/elf.h: Fix build error with unknown type name 'bool'. 2024-10-15 12:35:10 +08:00
environ.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
envpath.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
ethtool.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
event.h [!] sched/event: Remove wait object dependency from event implementation 2025-10-31 19:56:32 -03:00
fdcheck.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
fdt.h qemu/armv7a: register cfi flash 2025-02-11 17:23:44 +08:00
gdbstub.h gdbstub: change send buffer to const char 2025-01-20 20:07:13 +08:00
hashtable.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
hrtimer.h sched/hrtimer: Update the comments. 2026-02-02 13:26:22 +08:00
idr.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
init.h sched: add trace points during system startup and board initialization 2026-01-27 03:18:11 +08:00
instrument.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
ipcc.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
irq.h sched/irq: Consolidate IRQ bounds checking into IRQ_TO_NDX macro 2026-01-28 13:35:30 +08:00
kmalloc.h userspace: Exclude nuttx/arch.h 2024-11-01 16:59:37 +08:00
kthread.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
lin.h LIN:adjust the LIN flag 2026-01-08 23:15:31 +08:00
lirc.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
list.h list: Fix the list conflicts. 2026-01-19 14:12:09 +08:00
list_type.h list: Fix the list conflicts. 2026-01-19 14:12:09 +08:00
macro.h macro: use portable variadic macros 2026-01-22 22:14:00 +08:00
memoryregion.h libs/misc/memoryregion: remove unused memory_region 2024-10-18 21:32:48 +08:00
mmcsd.h mmcsd:add postsleep fields for mmc_ioc_cmd 2024-10-15 02:06:00 +08:00
module.h libc/elf: rename modlib to libelf 2025-04-11 09:43:22 +08:00
mqueue.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
mutex.h sched/pthread: move pthread mutex from syscall to user-space 2026-01-22 12:40:49 -03:00
notifier.h include/debug.h: Move to include/nuttx/debug.h 2026-04-07 07:50:06 -03:00
nuttx.h macro/align: Fix ALIGN_UP and ALIGN_DOWN 2025-01-11 12:13:10 +08:00
page.h style: Fix "is is" typo across the codebase. 2026-03-24 09:39:26 +08:00
panic_notifier.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
pgalloc.h mm/gran: add gran_alloc_align API 2025-05-12 15:01:37 +08:00
plist.h driver/devfreq: DVFS framework for devices 2026-08-08 15:23:54 -03:00
progmem.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
pthread.h pthread: move pthread_cond to userspace 2026-01-26 16:26:39 +08:00
queue.h include: queue.h: Make flink clear after sq_rem 2024-10-16 13:56:49 +08:00
random.h libc: Refine the arc4random_buf implementation 2024-10-26 18:04:21 -03:00
reboot_notifier.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
rwsem.h sched/sem_rw.c: Add downgrade_write API for sem_rw 2026-01-07 22:47:09 +08:00
sched.h sched: add supplementary group IDs (setgroups/getgroups/initgroups) 2026-08-12 16:06:03 -03:00
sched_note.h note: add NOTE_DUMP_BINARY support for binary log dumping 2026-01-27 21:56:03 +08:00
scsi.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
sdio.h drivers/mmcsd: Switch SD cards into high speed. 2026-08-18 09:38:45 +08:00
sdio_slave.h style: fix spelling in code comments and strings 2025-05-23 10:48:41 +08:00
semaphore.h sched/semaphore: Keep a negative task id out of the mutex holder. 2026-08-09 10:05:30 +08:00
seqlock.h seqlock: Fix struct name and constants. 2025-12-22 10:22:06 -03:00
signal.h sched/signal: Remove shadow definitions to reduce unnecessary API 2025-10-14 17:40:18 +08:00
spawn.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
spinlock.h nuttx/atomic: replace atomic_fetch_xxx with atomic_xxx just like zephyr 2026-08-24 13:20:45 +08:00
spinlock_type.h seqlock: Fix struct name and constants. 2025-12-22 10:22:06 -03:00
streams.h libc/stream: Add support for lib_scanf 2025-06-20 09:48:39 +08:00
symtab.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00
tee.h drivers/misc/optee: Expanded RPC support. 2025-08-06 02:29:33 +08:00
thermal.h drivers/thermal: Add support for passive trip point 2025-02-16 11:22:41 -03:00
tls.h pthread: remove tl_lock 2026-01-26 20:56:12 +08:00
trace.h trace: fix macro line continuation formatting 2026-01-25 10:45:26 -03:00
uorb.h drivers/sensors: add initial support for fixed-point data for sensors 2026-05-02 00:56:42 +08:00
userspace.h protect: move us_heap to userspace_data_s 2026-02-02 11:06:53 +08:00
vt100.h Documentation: nsh: document the top command 2026-07-11 09:15:15 -03:00
wdog.h drivers: Fix comment typos — 'Pubic' → 'Public' across drivers and headers. 2026-07-02 13:29:48 +08:00
wqueue.h !sys/types.h: change time_t and clock_t to int64_t to align with other OSes 2026-05-19 16:21:28 +08:00
zoneinfo.h include: migrate to SPDX identifier 2024-10-04 08:18:42 +08:00